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Acquisition of Inergy Propane (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  |  |
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Aug. 14, 2012 | Aug. 01, 2012 | Sep. 29, 2012 | Sep. 24, 2011 | Aug. 01, 2012 Customer relationships [Member] | Aug. 01, 2012 Non-compete agreements [Member] | Aug. 01, 2012 Other intangible assets [Member] | Aug. 01, 2012 Inergy Notes [Member] | Aug. 01, 2012 Inergy Senior Notes due 2018 [Member] | Aug. 01, 2012 Inergy Senior Notes due 2021 [Member] | Aug. 01, 2012 SPH Notes [Member] | Aug. 01, 2012 SPH Senior Notes due 2018 [Member] | Aug. 01, 2012 SPH Senior Notes due 2021 [Member] | Aug. 14, 2012 364-Day Facility [Member] Amended Credit Agreement [Member] | Aug. 01, 2012 364-Day Facility [Member] Amended Credit Agreement [Member] | Sep. 28, 2013 Revolving Credit Facility [Member] Amended Credit Agreement [Member] | Aug. 01, 2012 Revolving Credit Facility [Member] Amended Credit Agreement [Member]
Assets acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 7,964 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | 36,076 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  | 30,457 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  | 2,067 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets acquired |  | 76,564 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant & equipment |  | 617,854 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | 445,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-compete agreements |  | 23,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets |  | 1,983 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 809,778 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  | 2,151 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  | 1,976,889 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued employment and benefit costs |  | 2,149 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer deposits and advances |  | 48,469 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities |  | 18,613 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other noncurrent liabilities |  | 16,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  | 85,974 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 1,890,915 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  | 9 years | 6 years | 4 years |  |  |  |  |  |  |  |  |  |
New common units issued as part of acquisition |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sales price of common units (in dollars per unit) |  | $ 43.1885 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New common units issued as part of acquisition (in units) |  | 13,892,587 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (in hundredths) |  |  |  |  |  |  |  |  | 7.00% | 6.875% |  | 7.50% | 7.375% |  |  |  |
Year of maturity of debt instrument |  |  |  |  |  |  |  |  | 2018 | 2021 |  | 2018 | 2021 |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |
Maximum potential cash payment to tendering noteholders as part of an acquisition |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consent payments to acquiree in connection with note exchange |  | 65,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid by acquiree to Partnership |  | 36,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount for which tenders and consents had been received (in hundredths) |  |  |  |  |  |  |  |  | 98.09% | 99.74% |  |  |  |  |  |  |
Equity Exchange Cash Consideration due to tendering noteholders in connection with note exchange |  | 184,761 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units issued in satisfaction of Inergy Cash Consideration (in units) |  | 307,835 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units issued to acquiree, including units issued in connection with note exchange (in units) |  | 14,200,422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units to be distributed by acquiree to its unitholders (in units) |  | 14,058,418 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 | 400,000 | 400,000
Term of facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 364 days |  |
Amount drawn on facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000 |  |
Repayments of lines of credit |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000 |  |  |
Aggregate amount of newly issued SPH notes |  |  |  |  |  |  |  |  |  |  | 1,075,043 |  |  |  |  |  |
Aggregate par value of notes |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Total new common units issued as part of an acquisition |  | 590,027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units retained by the acquiree |  | 5,942 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common units retained by the acquiree (in units) |  | 142,004 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid by acquiree to Partnership, net of amounts owed to acquiree by Partnership |  | 23,916 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units sold (in units) | 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated property, plant and equipment decreased |  | 33,302 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated intangible assets (principally customer relationships) increased |  | 39,583 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated other current assets decreased |  | 765 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated other noncurrent liabilities increased |  | 646 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net effect of adjustments |  | 4,870 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in annual depreciation expense |  |  | 205 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in annual amortization expense |  |  | 1,449 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unaudited pro forma combined financial information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | 1,842,698 | 2,242,876 |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  |  | $ 12,824 | $ 116,287 |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income per Common Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per unit) |  |  | $ 0.23 | $ 2.08 |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per unit) |  |  | $ 0.23 | $ 2.07 |  |  |  |  |  |  |  |  |  |  |  |  |

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